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Patent
G - Physics
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G03G 15/01 (2006.01) G03G 13/01 (2006.01) H04N 1/047 (2006.01) H04N 1/50 (2006.01) H04N 1/113 (2006.01) H04N 1/12 (2006.01)
Patent
CA 2077832
A single pass ROS system provides a plurality of latent images which may subsequently be developed in different colors. The ROS units are initially aligned so that each color image is precisely registered at the same relative position along the exposed area of a photoreceptor belt. The alignment is accomplished by forming a pair of opposed alignment apertures in the surface of the belt and detecting coincidence or lack of coincidence of signals generated by the beginning and end of each scan line. The skew correction is enabled by rotating an optical component in the ROS system to create the required rotation of the projected scan line so as to correct for the detected skew error caused primarily by belt conicity. Once the initial X and Y-axis alignments are complete, subsequent alignment is maintained through subsequent passes by checking the positions of the previously identified pixels as they advance past additional lead edge apertures formed in the process direction along the belt surface.
Costanza Daniel W.
Nowak William J.
Sim & Mcburney
Xerox Corporation
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